WELDING GROOVE OF LOW DUCTILE STEEL PIPE

• Main Author: INUI MASAHIRO
• Format: Patent
• Language: English
• Published: 18.01.1994
• Edition: 5
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

PURPOSE:To prevent the generation of a crack whose start point is at a toe of welding bead without reducing the workability of welding process in a butt arc welding of a low ductile steel pipe. CONSTITUTION:A groove whose front surface of base material to be brought in contact with a front surface of a scheduled welding bead is made a quickly inclining surface against the front surface of the scheduled welding bead is worked at the place X of inner circumferential side whose crack start point is at the welding toe part is hardly generated after forming the welding bead among places in which the groove is to be worked against butted parts 1, 2, and the groove whose front surface of the base material being brought in contact with the front surface of the scheduled welding bead become the loosely inclining surface is worked at the place Y of outer circumferential side in which the crack being made the welding toe part as the start point is easily generated after forming the welding bead among places whose groove is to be worked against the butted parts 1, 2.